[适用于 JavaScript 的 AWS SDK V3 API 参考指南](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/)详细描述了 适用于 JavaScript 的 AWS SDK 版本 3 (V3) 的所有 API 操作。

本文属于机器翻译版本。若本译文内容与英语原文存在差异，则一律以英文原文为准。

# 使用适用于 JavaScript (v3) 的 SDK 的亚马逊 Bedrock 运行时示例
<a name="javascript_bedrock-runtime_code_examples"></a>

以下代码示例向您展示了如何使用带有 Amazon Bedrock Runtime 的 适用于 JavaScript 的 AWS SDK (v3) 来执行操作和实现常见场景。

*场景*是向您演示如何通过在一个服务中调用多个函数或与其他 AWS 服务结合来完成特定任务的代码示例。

每个示例都包含一个指向完整源代码的链接，您可以从中找到有关如何在上下文中设置和运行代码的说明。

**Topics**
+ [开始使用](#get_started)
+ [场景](#scenarios)
+ [Amazon Nova](#amazon_nova)
+ [Amazon Nova Canvas](#amazon_nova_canvas)
+ [Anthropic Claude](#anthropic_claude)
+ [Cohere Command](#cohere_command)
+ [Meta Llama](#meta_llama)
+ [Mistral AI](#mistral_ai)

## 开始使用
<a name="get_started"></a>

### 开始使用 Amazon Bedrock
<a name="bedrock-runtime_Hello_javascript_topic"></a>

以下代码示例演示了如何开始使用 Amazon Bedrock。

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime#code-examples)中查找完整示例，了解如何进行设置和运行。

```
/**
 * @typedef {Object} Content
 * @property {string} text
 *
 * @typedef {Object} Usage
 * @property {number} input_tokens
 * @property {number} output_tokens
 *
 * @typedef {Object} ResponseBody
 * @property {Content[]} content
 * @property {Usage} usage
 */

import { fileURLToPath } from "node:url";
import {
  BedrockRuntimeClient,
  InvokeModelCommand,
} from "@aws-sdk/client-bedrock-runtime";

const AWS_REGION = "us-east-1";

const MODEL_ID = "anthropic.claude-3-haiku-20240307-v1:0";
const PROMPT = "Hi. In a short paragraph, explain what you can do.";

const hello = async () => {
  console.log("=".repeat(35));
  console.log("Welcome to the Amazon Bedrock demo!");
  console.log("=".repeat(35));

  console.log("Model: Anthropic Claude 3 Haiku");
  console.log(`Prompt: ${PROMPT}\n`);
  console.log("Invoking model...\n");

  // Create a new Bedrock Runtime client instance.
  const client = new BedrockRuntimeClient({ region: AWS_REGION });

  // Prepare the payload for the model.
  const payload = {
    anthropic_version: "bedrock-2023-05-31",
    max_tokens: 1000,
    messages: [{ role: "user", content: [{ type: "text", text: PROMPT }] }],
  };

  // Invoke Claude with the payload and wait for the response.
  const apiResponse = await client.send(
    new InvokeModelCommand({
      contentType: "application/json",
      body: JSON.stringify(payload),
      modelId: MODEL_ID,
    }),
  );

  // Decode and return the response(s)
  const decodedResponseBody = new TextDecoder().decode(apiResponse.body);
  /** @type {ResponseBody} */
  const responseBody = JSON.parse(decodedResponseBody);
  const responses = responseBody.content;

  if (responses.length === 1) {
    console.log(`Response: ${responses[0].text}`);
  } else {
    console.log("Haiku returned multiple responses:");
    console.log(responses);
  }

  console.log(`\nNumber of input tokens:   ${responseBody.usage.input_tokens}`);
  console.log(`Number of output tokens: ${responseBody.usage.output_tokens}`);
};

if (process.argv[1] === fileURLToPath(import.meta.url)) {
  await hello();
}
```
+  有关 API 的详细信息，请参阅 *适用于 JavaScript 的 AWS SDK API 参考[InvokeModel](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/InvokeModelCommand)*中的。

## 场景
<a name="scenarios"></a>

### 在 Amazon Bedrock 上调用多个基础模型
<a name="bedrock-runtime_Scenario_InvokeModels_javascript_topic"></a>

以下代码示例展示了如何在 Amazon Bedrock 上准备和向各种大型语言模型 (LLMs) 发送提示

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime#code-examples) 中查找完整示例，了解如何进行设置和运行。

```
import { fileURLToPath } from "node:url";
import {
  Scenario,
  ScenarioAction,
  ScenarioInput,
  ScenarioOutput,
} from "@aws-doc-sdk-examples/lib/scenario/index.js";
import { FoundationModels } from "../config/foundation_models.js";

/**
 * @typedef {Object} ModelConfig
 * @property {Function} module
 * @property {Function} invoker
 * @property {string} modelId
 * @property {string} modelName
 */

const greeting = new ScenarioOutput(
  "greeting",
  "Welcome to the Amazon Bedrock Runtime client demo!",
  { header: true },
);

const selectModel = new ScenarioInput("model", "First, select a model:", {
  type: "select",
  choices: Object.values(FoundationModels).map((model) => ({
    name: model.modelName,
    value: model,
  })),
});

const enterPrompt = new ScenarioInput("prompt", "Now, enter your prompt:", {
  type: "input",
});

const printDetails = new ScenarioOutput(
  "print details",
  /**
   * @param {{ model: ModelConfig, prompt: string }} c
   */
  (c) => console.log(`Invoking ${c.model.modelName} with '${c.prompt}'...`),
);

const invokeModel = new ScenarioAction(
  "invoke model",
  /**
   * @param {{ model: ModelConfig, prompt: string, response: string }} c
   */
  async (c) => {
    const modelModule = await c.model.module();
    const invoker = c.model.invoker(modelModule);
    c.response = await invoker(c.prompt, c.model.modelId);
  },
);

const printResponse = new ScenarioOutput(
  "print response",
  /**
   * @param {{ response: string }} c
   */
  (c) => c.response,
);

const scenario = new Scenario("Amazon Bedrock Runtime Demo", [
  greeting,
  selectModel,
  enterPrompt,
  printDetails,
  invokeModel,
  printResponse,
]);

if (process.argv[1] === fileURLToPath(import.meta.url)) {
  scenario.run();
}
```
+ 有关 API 详细信息，请参阅《适用于 JavaScript 的 AWS SDK API Reference》**中的以下主题。
  + [InvokeModel](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/InvokeModelCommand)
  + [InvokeModelWithResponseStream](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/InvokeModelWithResponseStreamCommand)

### 将工具与 Converse API 结合使用
<a name="bedrock-runtime_Scenario_ToolUse_javascript_topic"></a>

以下代码示例展示了如何在应用程序、生成式 AI 模型和互联工具之间建立典型的交互，或者 APIs 如何调解 AI 与外界之间的交互。该代码示例以将外部天气 API 连接到人工智能模型模型为例，它可以根据用户输入提供实时天气信息。

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime/scenarios/converse_tool_scenario#code-examples)中查找完整示例，了解如何进行设置和运行。
该场景流程的主要执行。该场景编排了用户、Amazon Bedrock Converse API 和天气工具之间的对话。  

```
/* Before running this JavaScript code example, set up your development environment, including your credentials.
This demo illustrates a tool use scenario using Amazon Bedrock's Converse API and a weather tool.
The script interacts with a foundation model on Amazon Bedrock to provide weather information based on user
input. It uses the Open-Meteo API (https://open-meteo.com) to retrieve current weather data for a given location.*/

import {
  Scenario,
  ScenarioAction,
  ScenarioInput,
  ScenarioOutput,
} from "@aws-doc-sdk-examples/lib/scenario/index.js";
import {
  BedrockRuntimeClient,
  ConverseCommand,
} from "@aws-sdk/client-bedrock-runtime";

import { parseArgs } from "node:util";
import { fileURLToPath } from "node:url";
import data from "./questions.json" with { type: "json" };
import toolConfig from "./tool_config.json" with { type: "json" };

const __filename = fileURLToPath(import.meta.url);

const systemPrompt = [
  {
    text:
      "You are a weather assistant that provides current weather data for user-specified locations using only\n" +
      "the Weather_Tool, which expects latitude and longitude. Infer the coordinates from the location yourself.\n" +
      "If the user provides coordinates, infer the approximate location and refer to it in your response.\n" +
      "To use the tool, you strictly apply the provided tool specification.\n" +
      "If the user specifies a state, country, or region, infer the locations of cities within that state.\n" +
      "\n" +
      "- Explain your step-by-step process, and give brief updates before each step.\n" +
      "- Only use the Weather_Tool for data. Never guess or make up information. \n" +
      "- Repeat the tool use for subsequent requests if necessary.\n" +
      "- If the tool errors, apologize, explain weather is unavailable, and suggest other options.\n" +
      "- Report temperatures in °C (°F) and wind in km/h (mph). Keep weather reports concise. Sparingly use\n" +
      "  emojis where appropriate.\n" +
      "- Only respond to weather queries. Remind off-topic users of your purpose. \n" +
      "- Never claim to search online, access external data, or use tools besides Weather_Tool.\n" +
      "- Complete the entire process until you have all required data before sending the complete response.",
  },
];
const tools_config = toolConfig;

/// Starts the conversation with the user and handles the interaction with Bedrock.
async function askQuestion(userMessage) {
  // The maximum number of recursive calls allowed in the tool use function.
  // This helps prevent infinite loops and potential performance issues.
  const max_recursions = 5;
  const messages = [
    {
      role: "user",
      content: [{ text: userMessage }],
    },
  ];
  try {
    const response = await SendConversationtoBedrock(messages);
    await ProcessModelResponseAsync(response, messages, max_recursions);
  } catch (error) {
    console.log("error ", error);
  }
}

// Sends the conversation, the system prompt, and the tool spec to Amazon Bedrock, and returns the response.
// param "messages" - The conversation history including the next message to send.
// return - The response from Amazon Bedrock.
async function SendConversationtoBedrock(messages) {
  const bedRockRuntimeClient = new BedrockRuntimeClient({
    region: "us-east-1",
  });
  try {
    const modelId = "amazon.nova-lite-v1:0";
    const response = await bedRockRuntimeClient.send(
      new ConverseCommand({
        modelId: modelId,
        messages: messages,
        system: systemPrompt,
        toolConfig: tools_config,
      }),
    );
    return response;
  } catch (caught) {
    if (caught.name === "ModelNotReady") {
      console.log(
        "`${caught.name}` - Model not ready, please wait and try again.",
      );
      throw caught;
    }
    if (caught.name === "BedrockRuntimeException") {
      console.log(
        '`${caught.name}` - "Error occurred while sending Converse request.',
      );
      throw caught;
    }
  }
}

// Processes the response received via Amazon Bedrock and performs the necessary actions based on the stop reason.
// param "response" - The model's response returned via Amazon Bedrock.
// param "messages" - The conversation history.
// param "max_recursions" - The maximum number of recursive calls allowed.
async function ProcessModelResponseAsync(response, messages, max_recursions) {
  if (max_recursions <= 0) {
    await HandleToolUseAsync(response, messages);
  }
  if (response.stopReason === "tool_use") {
    await HandleToolUseAsync(response, messages, max_recursions - 1);
  }
  if (response.stopReason === "end_turn") {
    const messageToPrint = response.output.message.content[0].text;
    console.log(messageToPrint.replace(/<[^>]+>/g, ""));
  }
}
// Handles the tool use case by invoking the specified tool and sending the tool's response back to Bedrock.
// The tool response is appended to the conversation, and the conversation is sent back to Amazon Bedrock for further processing.
// param "response" - the model's response containing the tool use request.
// param "messages" - the conversation history.
// param "max_recursions" - The maximum number of recursive calls allowed.
async function HandleToolUseAsync(response, messages, max_recursions) {
  const toolResultFinal = [];
  try {
    const output_message = response.output.message;
    messages.push(output_message);
    const toolRequests = output_message.content;
    const toolMessage = toolRequests[0].text;
    console.log(toolMessage.replace(/<[^>]+>/g, ""));
    for (const toolRequest of toolRequests) {
      if (Object.hasOwn(toolRequest, "toolUse")) {
        const toolUse = toolRequest.toolUse;
        const latitude = toolUse.input.latitude;
        const longitude = toolUse.input.longitude;
        const toolUseID = toolUse.toolUseId;
        console.log(
          `Requesting tool ${toolUse.name}, Tool use id ${toolUseID}`,
        );
        if (toolUse.name === "Weather_Tool") {
          try {
            const current_weather = await callWeatherTool(
              longitude,
              latitude,
            ).then((current_weather) => current_weather);
            const currentWeather = current_weather;
            const toolResult = {
              toolResult: {
                toolUseId: toolUseID,
                content: [{ json: currentWeather }],
              },
            };
            toolResultFinal.push(toolResult);
          } catch (err) {
            console.log("An error occurred. ", err);
          }
        }
      }
    }

    const toolResultMessage = {
      role: "user",
      content: toolResultFinal,
    };
    messages.push(toolResultMessage);
    // Send the conversation to Amazon Bedrock
    await ProcessModelResponseAsync(
      await SendConversationtoBedrock(messages),
      messages,
    );
  } catch (error) {
    console.log("An error occurred. ", error);
  }
}
// Call the Weathertool.
// param = longitude of location
// param = latitude of location
async function callWeatherTool(longitude, latitude) {
  // Open-Meteo API endpoint
  const apiUrl = `https://api.open-meteo.com/v1/forecast?latitude=${latitude}&longitude=${longitude}&current_weather=true`;

  // Fetch the weather data.
  return fetch(apiUrl)
    .then((response) => {
      return response.json().then((current_weather) => {
        return current_weather;
      });
    })
    .catch((error) => {
      console.error("Error fetching weather data:", error);
    });
}
/**
 * Used repeatedly to have the user press enter.
 * @type {ScenarioInput}
 */
const pressEnter = new ScenarioInput("continue", "Press Enter to continue", {
  type: "input",
  default: "",
});

const greet = new ScenarioOutput(
  "greet",
  "Welcome to the Amazon Bedrock Tool Use demo! \n" +
    "This assistant provides current weather information for user-specified locations. " +
    "You can ask for weather details by providing the location name or coordinates." +
    "Weather information will be provided using a custom Tool and open-meteo API." +
    "For the purposes of this example, we'll use in order the questions in ./questions.json :\n" +
    "What's the weather like in Seattle? " +
    "What's the best kind of cat? " +
    "Where is the warmest city in Washington State right now? " +
    "What's the warmest city in California right now?\n" +
    "To exit the program, simply type 'x' and press Enter.\n" +
    "Have fun and experiment with the app by editing the questions in ./questions.json! " +
    "P.S.: You're not limited to single locations, or even to using English! ",

  { header: true },
);
const displayAskQuestion1 = new ScenarioOutput(
  "displayAskQuestion1",
  "Press enter to ask question number 1 (default is 'What's the weather like in Seattle?')",
);

const askQuestion1 = new ScenarioAction(
  "askQuestion1",
  async (/** @type {State} */ state) => {
    const userMessage1 = data.questions["question-1"];
    await askQuestion(userMessage1);
  },
);

const displayAskQuestion2 = new ScenarioOutput(
  "displayAskQuestion2",
  "Press enter to ask question number 2 (default is 'What's the best kind of cat?')",
);

const askQuestion2 = new ScenarioAction(
  "askQuestion2",
  async (/** @type {State} */ state) => {
    const userMessage2 = data.questions["question-2"];
    await askQuestion(userMessage2);
  },
);
const displayAskQuestion3 = new ScenarioOutput(
  "displayAskQuestion3",
  "Press enter to ask question number 3 (default is 'Where is the warmest city in Washington State right now?')",
);

const askQuestion3 = new ScenarioAction(
  "askQuestion3",
  async (/** @type {State} */ state) => {
    const userMessage3 = data.questions["question-3"];
    await askQuestion(userMessage3);
  },
);

const displayAskQuestion4 = new ScenarioOutput(
  "displayAskQuestion4",
  "Press enter to ask question number 4 (default is 'What's the warmest city in California right now?')",
);

const askQuestion4 = new ScenarioAction(
  "askQuestion4",
  async (/** @type {State} */ state) => {
    const userMessage4 = data.questions["question-4"];
    await askQuestion(userMessage4);
  },
);

const goodbye = new ScenarioOutput(
  "goodbye",
  "Thank you for checking out the Amazon Bedrock Tool Use demo. We hope you\n" +
    "learned something new, or got some inspiration for your own apps today!\n" +
    "For more Bedrock examples in different programming languages, have a look at:\n" +
    "https://docs.aws.amazon.com/bedrock/latest/userguide/service_code_examples.html",
);

const myScenario = new Scenario("Converse Tool Scenario", [
  greet,
  pressEnter,
  displayAskQuestion1,
  askQuestion1,
  pressEnter,
  displayAskQuestion2,
  askQuestion2,
  pressEnter,
  displayAskQuestion3,
  askQuestion3,
  pressEnter,
  displayAskQuestion4,
  askQuestion4,
  pressEnter,
  goodbye,
]);

/** @type {{ stepHandlerOptions: StepHandlerOptions }} */
export const main = async (stepHandlerOptions) => {
  await myScenario.run(stepHandlerOptions);
};

// Invoke main function if this file was run directly.
if (process.argv[1] === fileURLToPath(import.meta.url)) {
  const { values } = parseArgs({
    options: {
      yes: {
        type: "boolean",
        short: "y",
      },
    },
  });
  main({ confirmAll: values.yes });
}
```
+  有关 API 详细信息，请参阅《适用于 JavaScript 的 AWS SDK API Reference》**中的 [Converse](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/ConverseCommand)。

## Amazon Nova
<a name="amazon_nova"></a>

### Converse
<a name="bedrock-runtime_Converse_AmazonNovaText_javascript_topic"></a>

以下代码示例演示如何使用 Bedrock 的 Converse API 向 Amazon Nova 发送文本消息。

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime#code-examples)中查找完整示例，了解如何进行设置和运行。
使用 Bedrock 的 Converse API 向 Amazon Nova 发送文本消息。  

```
// This example demonstrates how to use the Amazon Nova foundation models to generate text.
// It shows how to:
// - Set up the Amazon Bedrock runtime client
// - Create a message
// - Configure and send a request
// - Process the response

import {
  BedrockRuntimeClient,
  ConversationRole,
  ConverseCommand,
} from "@aws-sdk/client-bedrock-runtime";

// Step 1: Create the Amazon Bedrock runtime client
// Credentials will be automatically loaded from the environment.
const client = new BedrockRuntimeClient({ region: "us-east-1" });

// Step 2: Specify which model to use:
// Available Amazon Nova models and their characteristics:
// - Amazon Nova Micro: Text-only model optimized for lowest latency and cost
// - Amazon Nova Lite:  Fast, low-cost multimodal model for image, video, and text
// - Amazon Nova Pro:   Advanced multimodal model balancing accuracy, speed, and cost
//
// For the most current model IDs, see:
// https://docs.aws.amazon.com/bedrock/latest/userguide/models-supported.html
const modelId = "amazon.nova-lite-v1:0";

// Step 3: Create the message
// The message includes the text prompt and specifies that it comes from the user
const inputText =
  "Describe the purpose of a 'hello world' program in one line.";
const message = {
  content: [{ text: inputText }],
  role: ConversationRole.USER,
};

// Step 4: Configure the request
// Optional parameters to control the model's response:
// - maxTokens: maximum number of tokens to generate
// - temperature: randomness (max: 1.0, default: 0.7)
//   OR
// - topP: diversity of word choice (max: 1.0, default: 0.9)
// Note: Use either temperature OR topP, but not both
const request = {
  modelId,
  messages: [message],
  inferenceConfig: {
    maxTokens: 500, // The maximum response length
    temperature: 0.5, // Using temperature for randomness control
    //topP: 0.9,        // Alternative: use topP instead of temperature
  },
};

// Step 5: Send and process the request
// - Send the request to the model
// - Extract and return the generated text from the response
try {
  const response = await client.send(new ConverseCommand(request));
  console.log(response.output.message.content[0].text);
} catch (error) {
  console.error(`ERROR: Can't invoke '${modelId}'. Reason: ${error.message}`);
  throw error;
}
```
使用 Bedrock 的 Converse API 和工具配置向 Amazon Nova 发送消息对话。  

```
// This example demonstrates how to send a conversation of messages to Amazon Nova using Bedrock's Converse API with a tool configuration.
// It shows how to:
// - 1. Set up the Amazon Bedrock runtime client
// - 2. Define the parameters required enable Amazon Bedrock to use a tool when formulating its response (model ID, user input, system prompt, and the tool spec)
// - 3. Send the request to Amazon Bedrock, and returns the response.
// - 4. Add the tool response to the conversation, and send it back to Amazon Bedrock.
// - 5. Publish the response.

import {
  BedrockRuntimeClient,
  ConverseCommand,
} from "@aws-sdk/client-bedrock-runtime";

// Step 1: Create the Amazon Bedrock runtime client

// Credentials will be automatically loaded from the environment
const bedRockRuntimeClient = new BedrockRuntimeClient({
  region: "us-east-1",
});

// Step 2. Define the parameters required enable Amazon Bedrock to use a tool when formulating its response.

// The Bedrock Model ID.
const modelId = "amazon.nova-lite-v1:0";

// The system prompt to help Amazon Bedrock craft it's response.
const system_prompt = [
  {
    text:
      "You are a music expert that provides the most popular song played on a radio station, using only the\n" +
      "the top_song tool, which he call sign for the radio station for which you want the most popular song. " +
      "Example calls signs are WZPZ and WKRP. \n" +
      "- Only use the top_song tool. Never guess or make up information. \n" +
      "- If the tool errors, apologize, explain weather is unavailable, and suggest other options.\n" +
      "- Only respond to queries about the most popular song played on a radio station\n" +
      "Remind off-topic users of your purpose. \n" +
      "- Never claim to search online, access external data, or use tools besides the top_song tool.\n",
  },
];
//  The user's question.
const message = [
  {
    role: "user",
    content: [{ text: "What is the most popular song on WZPZ?" }],
  },
];
// The tool specification. In this case, it uses an example schema for
// a tool that gets the most popular song played on a radio station.
const tool_config = {
  tools: [
    {
      toolSpec: {
        name: "top_song",
        description: "Get the most popular song played on a radio station.",
        inputSchema: {
          json: {
            type: "object",
            properties: {
              sign: {
                type: "string",
                description:
                  "The call sign for the radio station for which you want the most popular song. Example calls signs are WZPZ and WKRP.",
              },
            },
            required: ["sign"],
          },
        },
      },
    },
  ],
};

// Helper function to return the song and artist from top_song tool.
async function get_top_song(call_sign) {
  try {
    if (call_sign === "WZPZ") {
      const song = "Elemental Hotel";
      const artist = "8 Storey Hike";
      return { song, artist };
    }
  } catch (error) {
    console.log(`${error.message}`);
  }
}

// 3. Send the request to Amazon Bedrock, and returns the response.
export async function SendConversationtoBedrock(
  modelId,
  message,
  system_prompt,
  tool_config,
) {
  try {
    const response = await bedRockRuntimeClient.send(
      new ConverseCommand({
        modelId: modelId,
        messages: message,
        system: system_prompt,
        toolConfig: tool_config,
      }),
    );
    if (response.stopReason === "tool_use") {
      const toolResultFinal = [];
      try {
        const output_message = response.output.message;
        message.push(output_message);
        const toolRequests = output_message.content;
        const toolMessage = toolRequests[0].text;
        console.log(toolMessage.replace(/<[^>]+>/g, ""));
        for (const toolRequest of toolRequests) {
          if (Object.hasOwn(toolRequest, "toolUse")) {
            const toolUse = toolRequest.toolUse;
            const sign = toolUse.input.sign;
            const toolUseID = toolUse.toolUseId;
            console.log(
              `Requesting tool ${toolUse.name}, Tool use id ${toolUseID}`,
            );
            if (toolUse.name === "top_song") {
              const toolResult = [];
              try {
                const top_song = await get_top_song(toolUse.input.sign).then(
                  (top_song) => top_song,
                );
                const toolResult = {
                  toolResult: {
                    toolUseId: toolUseID,
                    content: [
                      {
                        json: { song: top_song.song, artist: top_song.artist },
                      },
                    ],
                  },
                };
                toolResultFinal.push(toolResult);
              } catch (err) {
                const toolResult = {
                  toolUseId: toolUseID,
                  content: [{ json: { text: err.message } }],
                  status: "error",
                };
              }
            }
          }
        }
        const toolResultMessage = {
          role: "user",
          content: toolResultFinal,
        };
        // Step 4. Add the tool response to the conversation, and send it back to Amazon Bedrock.

        message.push(toolResultMessage);
        await SendConversationtoBedrock(
          modelId,
          message,
          system_prompt,
          tool_config,
        );
      } catch (caught) {
        console.error(`${caught.message}`);
        throw caught;
      }
    }

    // 4. Publish the response.
    if (response.stopReason === "end_turn") {
      const finalMessage = response.output.message.content[0].text;
      const messageToPrint = finalMessage.replace(/<[^>]+>/g);
      console.log(messageToPrint.replace(/<[^>]+>/g));
      return messageToPrint;
    }
  } catch (caught) {
    if (caught.name === "ModelNotReady") {
      console.log(
        `${caught.name} - Model not ready, please wait and try again.`,
      );
      throw caught;
    }
    if (caught.name === "BedrockRuntimeException") {
      console.log(
        `${caught.name} - Error occurred while sending Converse request`,
      );
      throw caught;
    }
  }
}
await SendConversationtoBedrock(modelId, message, system_prompt, tool_config);
```
+  有关 API 详细信息，请参阅《适用于 JavaScript 的 AWS SDK API Reference》**中的 [Converse](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/ConverseCommand)。

### ConverseStream
<a name="bedrock-runtime_ConverseStream_AmazonNovaText_javascript_topic"></a>

以下代码示例演示如何使用 Bedrock 的 Converse API 向 Amazon Nova 发送文本消息并实时处理响应流。

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime#code-examples)中查找完整示例，了解如何进行设置和运行。
使用 Bedrock 的 Converse API 向 Amazon Nova 发送文本消息并实时处理回复流。  

```
// This example demonstrates how to use the Amazon Nova foundation models
// to generate streaming text responses.
// It shows how to:
// - Set up the Amazon Bedrock runtime client
// - Create a message
// - Configure a streaming request
// - Process the streaming response

import {
  BedrockRuntimeClient,
  ConversationRole,
  ConverseStreamCommand,
} from "@aws-sdk/client-bedrock-runtime";

// Step 1: Create the Amazon Bedrock runtime client
// Credentials will be automatically loaded from the environment
const client = new BedrockRuntimeClient({ region: "us-east-1" });

// Step 2: Specify which model to use
// Available Amazon Nova models and their characteristics:
// - Amazon Nova Micro: Text-only model optimized for lowest latency and cost
// - Amazon Nova Lite:  Fast, low-cost multimodal model for image, video, and text
// - Amazon Nova Pro:   Advanced multimodal model balancing accuracy, speed, and cost
//
// For the most current model IDs, see:
// https://docs.aws.amazon.com/bedrock/latest/userguide/models-supported.html
const modelId = "amazon.nova-lite-v1:0";

// Step 3: Create the message
// The message includes the text prompt and specifies that it comes from the user
const inputText =
  "Describe the purpose of a 'hello world' program in one paragraph";
const message = {
  content: [{ text: inputText }],
  role: ConversationRole.USER,
};

// Step 4: Configure the streaming request
// Optional parameters to control the model's response:
// - maxTokens: maximum number of tokens to generate
// - temperature: randomness (max: 1.0, default: 0.7)
//   OR
// - topP: diversity of word choice (max: 1.0, default: 0.9)
// Note: Use either temperature OR topP, but not both
const request = {
  modelId,
  messages: [message],
  inferenceConfig: {
    maxTokens: 500, // The maximum response length
    temperature: 0.5, // Using temperature for randomness control
    //topP: 0.9,        // Alternative: use topP instead of temperature
  },
};

// Step 5: Send and process the streaming request
// - Send the request to the model
// - Process each chunk of the streaming response
try {
  const response = await client.send(new ConverseStreamCommand(request));

  for await (const chunk of response.stream) {
    if (chunk.contentBlockDelta) {
      // Print each text chunk as it arrives
      process.stdout.write(chunk.contentBlockDelta.delta?.text || "");
    }
  }
} catch (error) {
  console.error(`ERROR: Can't invoke '${modelId}'. Reason: ${error.message}`);
  process.exitCode = 1;
}
```
+  有关 API 的详细信息，请参阅 *适用于 JavaScript 的 AWS SDK API 参考[ConverseStream](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/ConverseStreamCommand)*中的。

### 场景：将工具与 Converse API 搭配使用
<a name="bedrock-runtime_Scenario_ToolUseDemo_AmazonNova_javascript_topic"></a>

以下代码示例展示了如何在应用程序、生成式 AI 模型和互联工具之间建立典型的交互，或者 APIs 如何调解 AI 与外界之间的交互。该代码示例以将外部天气 API 连接到人工智能模型模型为例，它可以根据用户输入提供实时天气信息。

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime/scenarios/converse_tool_scenario#code-examples)中查找完整示例，了解如何进行设置和运行。
该场景流程的主要执行。该场景编排了用户、Amazon Bedrock Converse API 和天气工具之间的对话。  

```
/* Before running this JavaScript code example, set up your development environment, including your credentials.
This demo illustrates a tool use scenario using Amazon Bedrock's Converse API and a weather tool.
The script interacts with a foundation model on Amazon Bedrock to provide weather information based on user
input. It uses the Open-Meteo API (https://open-meteo.com) to retrieve current weather data for a given location.*/

import {
  Scenario,
  ScenarioAction,
  ScenarioInput,
  ScenarioOutput,
} from "@aws-doc-sdk-examples/lib/scenario/index.js";
import {
  BedrockRuntimeClient,
  ConverseCommand,
} from "@aws-sdk/client-bedrock-runtime";

import { parseArgs } from "node:util";
import { fileURLToPath } from "node:url";
import data from "./questions.json" with { type: "json" };
import toolConfig from "./tool_config.json" with { type: "json" };

const __filename = fileURLToPath(import.meta.url);

const systemPrompt = [
  {
    text:
      "You are a weather assistant that provides current weather data for user-specified locations using only\n" +
      "the Weather_Tool, which expects latitude and longitude. Infer the coordinates from the location yourself.\n" +
      "If the user provides coordinates, infer the approximate location and refer to it in your response.\n" +
      "To use the tool, you strictly apply the provided tool specification.\n" +
      "If the user specifies a state, country, or region, infer the locations of cities within that state.\n" +
      "\n" +
      "- Explain your step-by-step process, and give brief updates before each step.\n" +
      "- Only use the Weather_Tool for data. Never guess or make up information. \n" +
      "- Repeat the tool use for subsequent requests if necessary.\n" +
      "- If the tool errors, apologize, explain weather is unavailable, and suggest other options.\n" +
      "- Report temperatures in °C (°F) and wind in km/h (mph). Keep weather reports concise. Sparingly use\n" +
      "  emojis where appropriate.\n" +
      "- Only respond to weather queries. Remind off-topic users of your purpose. \n" +
      "- Never claim to search online, access external data, or use tools besides Weather_Tool.\n" +
      "- Complete the entire process until you have all required data before sending the complete response.",
  },
];
const tools_config = toolConfig;

/// Starts the conversation with the user and handles the interaction with Bedrock.
async function askQuestion(userMessage) {
  // The maximum number of recursive calls allowed in the tool use function.
  // This helps prevent infinite loops and potential performance issues.
  const max_recursions = 5;
  const messages = [
    {
      role: "user",
      content: [{ text: userMessage }],
    },
  ];
  try {
    const response = await SendConversationtoBedrock(messages);
    await ProcessModelResponseAsync(response, messages, max_recursions);
  } catch (error) {
    console.log("error ", error);
  }
}

// Sends the conversation, the system prompt, and the tool spec to Amazon Bedrock, and returns the response.
// param "messages" - The conversation history including the next message to send.
// return - The response from Amazon Bedrock.
async function SendConversationtoBedrock(messages) {
  const bedRockRuntimeClient = new BedrockRuntimeClient({
    region: "us-east-1",
  });
  try {
    const modelId = "amazon.nova-lite-v1:0";
    const response = await bedRockRuntimeClient.send(
      new ConverseCommand({
        modelId: modelId,
        messages: messages,
        system: systemPrompt,
        toolConfig: tools_config,
      }),
    );
    return response;
  } catch (caught) {
    if (caught.name === "ModelNotReady") {
      console.log(
        "`${caught.name}` - Model not ready, please wait and try again.",
      );
      throw caught;
    }
    if (caught.name === "BedrockRuntimeException") {
      console.log(
        '`${caught.name}` - "Error occurred while sending Converse request.',
      );
      throw caught;
    }
  }
}

// Processes the response received via Amazon Bedrock and performs the necessary actions based on the stop reason.
// param "response" - The model's response returned via Amazon Bedrock.
// param "messages" - The conversation history.
// param "max_recursions" - The maximum number of recursive calls allowed.
async function ProcessModelResponseAsync(response, messages, max_recursions) {
  if (max_recursions <= 0) {
    await HandleToolUseAsync(response, messages);
  }
  if (response.stopReason === "tool_use") {
    await HandleToolUseAsync(response, messages, max_recursions - 1);
  }
  if (response.stopReason === "end_turn") {
    const messageToPrint = response.output.message.content[0].text;
    console.log(messageToPrint.replace(/<[^>]+>/g, ""));
  }
}
// Handles the tool use case by invoking the specified tool and sending the tool's response back to Bedrock.
// The tool response is appended to the conversation, and the conversation is sent back to Amazon Bedrock for further processing.
// param "response" - the model's response containing the tool use request.
// param "messages" - the conversation history.
// param "max_recursions" - The maximum number of recursive calls allowed.
async function HandleToolUseAsync(response, messages, max_recursions) {
  const toolResultFinal = [];
  try {
    const output_message = response.output.message;
    messages.push(output_message);
    const toolRequests = output_message.content;
    const toolMessage = toolRequests[0].text;
    console.log(toolMessage.replace(/<[^>]+>/g, ""));
    for (const toolRequest of toolRequests) {
      if (Object.hasOwn(toolRequest, "toolUse")) {
        const toolUse = toolRequest.toolUse;
        const latitude = toolUse.input.latitude;
        const longitude = toolUse.input.longitude;
        const toolUseID = toolUse.toolUseId;
        console.log(
          `Requesting tool ${toolUse.name}, Tool use id ${toolUseID}`,
        );
        if (toolUse.name === "Weather_Tool") {
          try {
            const current_weather = await callWeatherTool(
              longitude,
              latitude,
            ).then((current_weather) => current_weather);
            const currentWeather = current_weather;
            const toolResult = {
              toolResult: {
                toolUseId: toolUseID,
                content: [{ json: currentWeather }],
              },
            };
            toolResultFinal.push(toolResult);
          } catch (err) {
            console.log("An error occurred. ", err);
          }
        }
      }
    }

    const toolResultMessage = {
      role: "user",
      content: toolResultFinal,
    };
    messages.push(toolResultMessage);
    // Send the conversation to Amazon Bedrock
    await ProcessModelResponseAsync(
      await SendConversationtoBedrock(messages),
      messages,
    );
  } catch (error) {
    console.log("An error occurred. ", error);
  }
}
// Call the Weathertool.
// param = longitude of location
// param = latitude of location
async function callWeatherTool(longitude, latitude) {
  // Open-Meteo API endpoint
  const apiUrl = `https://api.open-meteo.com/v1/forecast?latitude=${latitude}&longitude=${longitude}&current_weather=true`;

  // Fetch the weather data.
  return fetch(apiUrl)
    .then((response) => {
      return response.json().then((current_weather) => {
        return current_weather;
      });
    })
    .catch((error) => {
      console.error("Error fetching weather data:", error);
    });
}
/**
 * Used repeatedly to have the user press enter.
 * @type {ScenarioInput}
 */
const pressEnter = new ScenarioInput("continue", "Press Enter to continue", {
  type: "input",
  default: "",
});

const greet = new ScenarioOutput(
  "greet",
  "Welcome to the Amazon Bedrock Tool Use demo! \n" +
    "This assistant provides current weather information for user-specified locations. " +
    "You can ask for weather details by providing the location name or coordinates." +
    "Weather information will be provided using a custom Tool and open-meteo API." +
    "For the purposes of this example, we'll use in order the questions in ./questions.json :\n" +
    "What's the weather like in Seattle? " +
    "What's the best kind of cat? " +
    "Where is the warmest city in Washington State right now? " +
    "What's the warmest city in California right now?\n" +
    "To exit the program, simply type 'x' and press Enter.\n" +
    "Have fun and experiment with the app by editing the questions in ./questions.json! " +
    "P.S.: You're not limited to single locations, or even to using English! ",

  { header: true },
);
const displayAskQuestion1 = new ScenarioOutput(
  "displayAskQuestion1",
  "Press enter to ask question number 1 (default is 'What's the weather like in Seattle?')",
);

const askQuestion1 = new ScenarioAction(
  "askQuestion1",
  async (/** @type {State} */ state) => {
    const userMessage1 = data.questions["question-1"];
    await askQuestion(userMessage1);
  },
);

const displayAskQuestion2 = new ScenarioOutput(
  "displayAskQuestion2",
  "Press enter to ask question number 2 (default is 'What's the best kind of cat?')",
);

const askQuestion2 = new ScenarioAction(
  "askQuestion2",
  async (/** @type {State} */ state) => {
    const userMessage2 = data.questions["question-2"];
    await askQuestion(userMessage2);
  },
);
const displayAskQuestion3 = new ScenarioOutput(
  "displayAskQuestion3",
  "Press enter to ask question number 3 (default is 'Where is the warmest city in Washington State right now?')",
);

const askQuestion3 = new ScenarioAction(
  "askQuestion3",
  async (/** @type {State} */ state) => {
    const userMessage3 = data.questions["question-3"];
    await askQuestion(userMessage3);
  },
);

const displayAskQuestion4 = new ScenarioOutput(
  "displayAskQuestion4",
  "Press enter to ask question number 4 (default is 'What's the warmest city in California right now?')",
);

const askQuestion4 = new ScenarioAction(
  "askQuestion4",
  async (/** @type {State} */ state) => {
    const userMessage4 = data.questions["question-4"];
    await askQuestion(userMessage4);
  },
);

const goodbye = new ScenarioOutput(
  "goodbye",
  "Thank you for checking out the Amazon Bedrock Tool Use demo. We hope you\n" +
    "learned something new, or got some inspiration for your own apps today!\n" +
    "For more Bedrock examples in different programming languages, have a look at:\n" +
    "https://docs.aws.amazon.com/bedrock/latest/userguide/service_code_examples.html",
);

const myScenario = new Scenario("Converse Tool Scenario", [
  greet,
  pressEnter,
  displayAskQuestion1,
  askQuestion1,
  pressEnter,
  displayAskQuestion2,
  askQuestion2,
  pressEnter,
  displayAskQuestion3,
  askQuestion3,
  pressEnter,
  displayAskQuestion4,
  askQuestion4,
  pressEnter,
  goodbye,
]);

/** @type {{ stepHandlerOptions: StepHandlerOptions }} */
export const main = async (stepHandlerOptions) => {
  await myScenario.run(stepHandlerOptions);
};

// Invoke main function if this file was run directly.
if (process.argv[1] === fileURLToPath(import.meta.url)) {
  const { values } = parseArgs({
    options: {
      yes: {
        type: "boolean",
        short: "y",
      },
    },
  });
  main({ confirmAll: values.yes });
}
```
+  有关 API 详细信息，请参阅《适用于 JavaScript 的 AWS SDK API Reference》**中的 [Converse](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/ConverseCommand)。

## Amazon Nova Canvas
<a name="amazon_nova_canvas"></a>

### InvokeModel
<a name="bedrock-runtime_InvokeModel_AmazonNovaImageGeneration_javascript_topic"></a>

以下代码示例演示如何在 Amazon Bedrock 上调用 Amazon Nova Canvas 来生成图像。

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime#code-examples)中查找完整示例，了解如何进行设置和运行。
使用 Amazon Nova Canvas 创建图像。  

```
import {
  BedrockRuntimeClient,
  InvokeModelCommand,
} from "@aws-sdk/client-bedrock-runtime";
import { saveImage } from "../../utils/image-creation.js";
import { fileURLToPath } from "node:url";

/**
 * This example demonstrates how to use Amazon Nova Canvas to generate images.
 * It shows how to:
 * - Set up the Amazon Bedrock runtime client
 * - Configure the image generation parameters
 * - Send a request to generate an image
 * - Process the response and handle the generated image
 *
 * @returns {Promise<string>} Base64-encoded image data
 */
export const invokeModel = async () => {
  // Step 1: Create the Amazon Bedrock runtime client
  // Credentials will be automatically loaded from the environment
  const client = new BedrockRuntimeClient({ region: "us-east-1" });

  // Step 2: Specify which model to use
  // For the latest available models, see:
  // https://docs.aws.amazon.com/bedrock/latest/userguide/models-supported.html
  const modelId = "amazon.nova-canvas-v1:0";

  // Step 3: Configure the request payload
  // First, set the main parameters:
  // - prompt: Text description of the image to generate
  // - seed: Random number for reproducible generation (0 to 858,993,459)
  const prompt = "A stylized picture of a cute old steampunk robot";
  const seed = Math.floor(Math.random() * 858993460);

  // Then, create the payload using the following structure:
  // - taskType: TEXT_IMAGE (specifies text-to-image generation)
  // - textToImageParams: Contains the text prompt
  // - imageGenerationConfig: Contains optional generation settings (seed, quality, etc.)
  // For a list of available request parameters, see:
  // https://docs.aws.amazon.com/nova/latest/userguide/image-gen-req-resp-structure.html
  const payload = {
    taskType: "TEXT_IMAGE",
    textToImageParams: {
      text: prompt,
    },
    imageGenerationConfig: {
      seed,
      quality: "standard",
    },
  };

  // Step 4: Send and process the request
  // - Embed the payload in a request object
  // - Send the request to the model
  // - Extract and return the generated image data from the response
  try {
    const request = {
      modelId,
      body: JSON.stringify(payload),
    };
    const response = await client.send(new InvokeModelCommand(request));

    const decodedResponseBody = new TextDecoder().decode(response.body);
    // The response includes an array of base64-encoded PNG images
    /** @type {{images: string[]}} */
    const responseBody = JSON.parse(decodedResponseBody);
    return responseBody.images[0]; // Base64-encoded image data
  } catch (error) {
    console.error(`ERROR: Can't invoke '${modelId}'. Reason: ${error.message}`);
    throw error;
  }
};

// If run directly, execute the example and save the generated image
if (process.argv[1] === fileURLToPath(import.meta.url)) {
  console.log("Generating image. This may take a few seconds...");
  invokeModel()
    .then(async (imageData) => {
      const imagePath = await saveImage(imageData, "nova-canvas");
      // Example path: javascriptv3/example_code/bedrock-runtime/output/nova-canvas/image-01.png
      console.log(`Image saved to: ${imagePath}`);
    })
    .catch((error) => {
      console.error("Execution failed:", error);
      process.exitCode = 1;
    });
}
```
+  有关 API 的详细信息，请参阅 *适用于 JavaScript 的 AWS SDK API 参考[InvokeModel](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/InvokeModelCommand)*中的。

## Anthropic Claude
<a name="anthropic_claude"></a>

### Converse
<a name="bedrock-runtime_Converse_AnthropicClaude_javascript_topic"></a>

以下代码示例演示如何使用 Bedrock 的 Converse API 向 Anthropic Claude 发送文本消息。

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime#code-examples)中查找完整示例，了解如何进行设置和运行。
使用 Bedrock 的 Converse API 向 Anthropic Claude 发送文本消息。  

```
// Use the Conversation API to send a text message to Anthropic Claude.

import {
  BedrockRuntimeClient,
  ConverseCommand,
} from "@aws-sdk/client-bedrock-runtime";

// Create a Bedrock Runtime client in the AWS Region you want to use.
const client = new BedrockRuntimeClient({ region: "us-east-1" });

// Set the model ID, e.g., Claude 3 Haiku.
const modelId = "anthropic.claude-3-haiku-20240307-v1:0";

// Start a conversation with the user message.
const userMessage =
  "Describe the purpose of a 'hello world' program in one line.";
const conversation = [
  {
    role: "user",
    content: [{ text: userMessage }],
  },
];

// Create a command with the model ID, the message, and a basic configuration.
const command = new ConverseCommand({
  modelId,
  messages: conversation,
  inferenceConfig: { maxTokens: 512, temperature: 0.5, topP: 0.9 },
});

try {
  // Send the command to the model and wait for the response
  const response = await client.send(command);

  // Extract and print the response text.
  const responseText = response.output.message.content[0].text;
  console.log(responseText);
} catch (err) {
  console.log(`ERROR: Can't invoke '${modelId}'. Reason: ${err}`);
  process.exit(1);
}
```
+  有关 API 详细信息，请参阅《适用于 JavaScript 的 AWS SDK API Reference》**中的 [Converse](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/ConverseCommand)。

### ConverseStream
<a name="bedrock-runtime_ConverseStream_AnthropicClaude_javascript_topic"></a>

以下代码示例演示如何使用 Bedrock 的 Converse API 向 Anthropic Claude 发送文本消息并实时处理响应流。

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime#code-examples)中查找完整示例，了解如何进行设置和运行。
使用 Bedrock 的 Converse API 向 Anthropic Claude 发送文本消息并实时处理响应流。  

```
// Use the Conversation API to send a text message to Anthropic Claude.

import {
  BedrockRuntimeClient,
  ConverseStreamCommand,
} from "@aws-sdk/client-bedrock-runtime";

// Create a Bedrock Runtime client in the AWS Region you want to use.
const client = new BedrockRuntimeClient({ region: "us-east-1" });

// Set the model ID, e.g., Claude 3 Haiku.
const modelId = "anthropic.claude-3-haiku-20240307-v1:0";

// Start a conversation with the user message.
const userMessage =
  "Describe the purpose of a 'hello world' program in one line.";
const conversation = [
  {
    role: "user",
    content: [{ text: userMessage }],
  },
];

// Create a command with the model ID, the message, and a basic configuration.
const command = new ConverseStreamCommand({
  modelId,
  messages: conversation,
  inferenceConfig: { maxTokens: 512, temperature: 0.5, topP: 0.9 },
});

try {
  // Send the command to the model and wait for the response
  const response = await client.send(command);

  // Extract and print the streamed response text in real-time.
  for await (const item of response.stream) {
    if (item.contentBlockDelta) {
      process.stdout.write(item.contentBlockDelta.delta?.text);
    }
  }
} catch (err) {
  console.log(`ERROR: Can't invoke '${modelId}'. Reason: ${err}`);
  process.exit(1);
}
```
+  有关 API 的详细信息，请参阅 *适用于 JavaScript 的 AWS SDK API 参考[ConverseStream](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/ConverseStreamCommand)*中的。

### InvokeModel
<a name="bedrock-runtime_InvokeModel_AnthropicClaude_javascript_topic"></a>

以下代码示例演示如何使用调用模型 API 向 Anthropic Claude 发送文本消息。

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime#code-examples)中查找完整示例，了解如何进行设置和运行。
使用调用模型 API 发送文本消息。  

```
import { fileURLToPath } from "node:url";

import { FoundationModels } from "../../config/foundation_models.js";
import {
  BedrockRuntimeClient,
  InvokeModelCommand,
  InvokeModelWithResponseStreamCommand,
} from "@aws-sdk/client-bedrock-runtime";

/**
 * @typedef {Object} ResponseContent
 * @property {string} text
 *
 * @typedef {Object} MessagesResponseBody
 * @property {ResponseContent[]} content
 *
 * @typedef {Object} Delta
 * @property {string} text
 *
 * @typedef {Object} Message
 * @property {string} role
 *
 * @typedef {Object} Chunk
 * @property {string} type
 * @property {Delta} delta
 * @property {Message} message
 */

/**
 * Invokes Anthropic Claude 3 using the Messages API.
 *
 * To learn more about the Anthropic Messages API, go to:
 * https://docs.aws.amazon.com/bedrock/latest/userguide/model-parameters-anthropic-claude-messages.html
 *
 * @param {string} prompt - The input text prompt for the model to complete.
 * @param {string} [modelId] - The ID of the model to use. Defaults to "anthropic.claude-3-haiku-20240307-v1:0".
 */
export const invokeModel = async (
  prompt,
  modelId = "anthropic.claude-3-haiku-20240307-v1:0",
) => {
  // Create a new Bedrock Runtime client instance.
  const client = new BedrockRuntimeClient({ region: "us-east-1" });

  // Prepare the payload for the model.
  const payload = {
    anthropic_version: "bedrock-2023-05-31",
    max_tokens: 1000,
    messages: [
      {
        role: "user",
        content: [{ type: "text", text: prompt }],
      },
    ],
  };

  // Invoke Claude with the payload and wait for the response.
  const command = new InvokeModelCommand({
    contentType: "application/json",
    body: JSON.stringify(payload),
    modelId,
  });
  const apiResponse = await client.send(command);

  // Decode and return the response(s)
  const decodedResponseBody = new TextDecoder().decode(apiResponse.body);
  /** @type {MessagesResponseBody} */
  const responseBody = JSON.parse(decodedResponseBody);
  return responseBody.content[0].text;
};

/**
 * Invokes Anthropic Claude 3 and processes the response stream.
 *
 * To learn more about the Anthropic Messages API, go to:
 * https://docs.aws.amazon.com/bedrock/latest/userguide/model-parameters-anthropic-claude-messages.html
 *
 * @param {string} prompt - The input text prompt for the model to complete.
 * @param {string} [modelId] - The ID of the model to use. Defaults to "anthropic.claude-3-haiku-20240307-v1:0".
 */
export const invokeModelWithResponseStream = async (
  prompt,
  modelId = "anthropic.claude-3-haiku-20240307-v1:0",
) => {
  // Create a new Bedrock Runtime client instance.
  const client = new BedrockRuntimeClient({ region: "us-east-1" });

  // Prepare the payload for the model.
  const payload = {
    anthropic_version: "bedrock-2023-05-31",
    max_tokens: 1000,
    messages: [
      {
        role: "user",
        content: [{ type: "text", text: prompt }],
      },
    ],
  };

  // Invoke Claude with the payload and wait for the API to respond.
  const command = new InvokeModelWithResponseStreamCommand({
    contentType: "application/json",
    body: JSON.stringify(payload),
    modelId,
  });
  const apiResponse = await client.send(command);

  let completeMessage = "";

  // Decode and process the response stream
  for await (const item of apiResponse.body) {
    /** @type Chunk */
    const chunk = JSON.parse(new TextDecoder().decode(item.chunk.bytes));
    const chunk_type = chunk.type;

    if (chunk_type === "content_block_delta") {
      const text = chunk.delta.text;
      completeMessage = completeMessage + text;
      process.stdout.write(text);
    }
  }

  // Return the final response
  return completeMessage;
};

// Invoke the function if this file was run directly.
if (process.argv[1] === fileURLToPath(import.meta.url)) {
  const prompt = 'Write a paragraph starting with: "Once upon a time..."';
  const modelId = FoundationModels.CLAUDE_3_HAIKU.modelId;
  console.log(`Prompt: ${prompt}`);
  console.log(`Model ID: ${modelId}`);

  try {
    console.log("-".repeat(53));
    const response = await invokeModel(prompt, modelId);
    console.log(`\n${"-".repeat(53)}`);
    console.log("Final structured response:");
    console.log(response);
  } catch (err) {
    console.log(`\n${err}`);
  }
}
```
+  有关 API 的详细信息，请参阅 *适用于 JavaScript 的 AWS SDK API 参考[InvokeModel](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/InvokeModelCommand)*中的。

### InvokeModelWithResponseStream
<a name="bedrock-runtime_InvokeModelWithResponseStream_AnthropicClaude_javascript_topic"></a>

以下代码示例演示如何使用调用模型 API 向 Anthropic Claude 模型发送文本消息并打印响应流。

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime#code-examples)中查找完整示例，了解如何进行设置和运行。
使用调用模型 API 发送文本消息并实时处理响应流。  

```
import { fileURLToPath } from "node:url";

import { FoundationModels } from "../../config/foundation_models.js";
import {
  BedrockRuntimeClient,
  InvokeModelCommand,
  InvokeModelWithResponseStreamCommand,
} from "@aws-sdk/client-bedrock-runtime";

/**
 * @typedef {Object} ResponseContent
 * @property {string} text
 *
 * @typedef {Object} MessagesResponseBody
 * @property {ResponseContent[]} content
 *
 * @typedef {Object} Delta
 * @property {string} text
 *
 * @typedef {Object} Message
 * @property {string} role
 *
 * @typedef {Object} Chunk
 * @property {string} type
 * @property {Delta} delta
 * @property {Message} message
 */

/**
 * Invokes Anthropic Claude 3 using the Messages API.
 *
 * To learn more about the Anthropic Messages API, go to:
 * https://docs.aws.amazon.com/bedrock/latest/userguide/model-parameters-anthropic-claude-messages.html
 *
 * @param {string} prompt - The input text prompt for the model to complete.
 * @param {string} [modelId] - The ID of the model to use. Defaults to "anthropic.claude-3-haiku-20240307-v1:0".
 */
export const invokeModel = async (
  prompt,
  modelId = "anthropic.claude-3-haiku-20240307-v1:0",
) => {
  // Create a new Bedrock Runtime client instance.
  const client = new BedrockRuntimeClient({ region: "us-east-1" });

  // Prepare the payload for the model.
  const payload = {
    anthropic_version: "bedrock-2023-05-31",
    max_tokens: 1000,
    messages: [
      {
        role: "user",
        content: [{ type: "text", text: prompt }],
      },
    ],
  };

  // Invoke Claude with the payload and wait for the response.
  const command = new InvokeModelCommand({
    contentType: "application/json",
    body: JSON.stringify(payload),
    modelId,
  });
  const apiResponse = await client.send(command);

  // Decode and return the response(s)
  const decodedResponseBody = new TextDecoder().decode(apiResponse.body);
  /** @type {MessagesResponseBody} */
  const responseBody = JSON.parse(decodedResponseBody);
  return responseBody.content[0].text;
};

/**
 * Invokes Anthropic Claude 3 and processes the response stream.
 *
 * To learn more about the Anthropic Messages API, go to:
 * https://docs.aws.amazon.com/bedrock/latest/userguide/model-parameters-anthropic-claude-messages.html
 *
 * @param {string} prompt - The input text prompt for the model to complete.
 * @param {string} [modelId] - The ID of the model to use. Defaults to "anthropic.claude-3-haiku-20240307-v1:0".
 */
export const invokeModelWithResponseStream = async (
  prompt,
  modelId = "anthropic.claude-3-haiku-20240307-v1:0",
) => {
  // Create a new Bedrock Runtime client instance.
  const client = new BedrockRuntimeClient({ region: "us-east-1" });

  // Prepare the payload for the model.
  const payload = {
    anthropic_version: "bedrock-2023-05-31",
    max_tokens: 1000,
    messages: [
      {
        role: "user",
        content: [{ type: "text", text: prompt }],
      },
    ],
  };

  // Invoke Claude with the payload and wait for the API to respond.
  const command = new InvokeModelWithResponseStreamCommand({
    contentType: "application/json",
    body: JSON.stringify(payload),
    modelId,
  });
  const apiResponse = await client.send(command);

  let completeMessage = "";

  // Decode and process the response stream
  for await (const item of apiResponse.body) {
    /** @type Chunk */
    const chunk = JSON.parse(new TextDecoder().decode(item.chunk.bytes));
    const chunk_type = chunk.type;

    if (chunk_type === "content_block_delta") {
      const text = chunk.delta.text;
      completeMessage = completeMessage + text;
      process.stdout.write(text);
    }
  }

  // Return the final response
  return completeMessage;
};

// Invoke the function if this file was run directly.
if (process.argv[1] === fileURLToPath(import.meta.url)) {
  const prompt = 'Write a paragraph starting with: "Once upon a time..."';
  const modelId = FoundationModels.CLAUDE_3_HAIKU.modelId;
  console.log(`Prompt: ${prompt}`);
  console.log(`Model ID: ${modelId}`);

  try {
    console.log("-".repeat(53));
    const response = await invokeModel(prompt, modelId);
    console.log(`\n${"-".repeat(53)}`);
    console.log("Final structured response:");
    console.log(response);
  } catch (err) {
    console.log(`\n${err}`);
  }
}
```
+  有关 API 的详细信息，请参阅 *适用于 JavaScript 的 AWS SDK API 参考[InvokeModelWithResponseStream](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/InvokeModelWithResponseStreamCommand)*中的。

## Cohere Command
<a name="cohere_command"></a>

### Converse
<a name="bedrock-runtime_Converse_CohereCommand_javascript_topic"></a>

以下代码示例演示如何使用 Bedrock 的 Converse API 向 Cohere Command 发送文本消息。

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime#code-examples)中查找完整示例，了解如何进行设置和运行。
使用 Bedrock 的 Converse API 向 Cohere Command 发送文本消息。  

```
// Use the Conversation API to send a text message to Cohere Command.

import {
  BedrockRuntimeClient,
  ConverseCommand,
} from "@aws-sdk/client-bedrock-runtime";

// Create a Bedrock Runtime client in the AWS Region you want to use.
const client = new BedrockRuntimeClient({ region: "us-east-1" });

// Set the model ID, e.g., Command R.
const modelId = "cohere.command-r-v1:0";

// Start a conversation with the user message.
const userMessage =
  "Describe the purpose of a 'hello world' program in one line.";
const conversation = [
  {
    role: "user",
    content: [{ text: userMessage }],
  },
];

// Create a command with the model ID, the message, and a basic configuration.
const command = new ConverseCommand({
  modelId,
  messages: conversation,
  inferenceConfig: { maxTokens: 512, temperature: 0.5, topP: 0.9 },
});

try {
  // Send the command to the model and wait for the response
  const response = await client.send(command);

  // Extract and print the response text.
  const responseText = response.output.message.content[0].text;
  console.log(responseText);
} catch (err) {
  console.log(`ERROR: Can't invoke '${modelId}'. Reason: ${err}`);
  process.exit(1);
}
```
+  有关 API 详细信息，请参阅《适用于 JavaScript 的 AWS SDK API Reference》**中的 [Converse](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/ConverseCommand)。

### ConverseStream
<a name="bedrock-runtime_ConverseStream_CohereCommand_javascript_topic"></a>

以下代码示例演示如何使用 Bedrock 的 Converse API 向 Cohere Command 发送文本消息并实时处理响应流。

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime#code-examples)中查找完整示例，了解如何进行设置和运行。
使用 Bedrock 的 Converse API 向 Cohere Command 发送文本消息并实时处理响应流。  

```
// Use the Conversation API to send a text message to Cohere Command.

import {
  BedrockRuntimeClient,
  ConverseStreamCommand,
} from "@aws-sdk/client-bedrock-runtime";

// Create a Bedrock Runtime client in the AWS Region you want to use.
const client = new BedrockRuntimeClient({ region: "us-east-1" });

// Set the model ID, e.g., Command R.
const modelId = "cohere.command-r-v1:0";

// Start a conversation with the user message.
const userMessage =
  "Describe the purpose of a 'hello world' program in one line.";
const conversation = [
  {
    role: "user",
    content: [{ text: userMessage }],
  },
];

// Create a command with the model ID, the message, and a basic configuration.
const command = new ConverseStreamCommand({
  modelId,
  messages: conversation,
  inferenceConfig: { maxTokens: 512, temperature: 0.5, topP: 0.9 },
});

try {
  // Send the command to the model and wait for the response
  const response = await client.send(command);

  // Extract and print the streamed response text in real-time.
  for await (const item of response.stream) {
    if (item.contentBlockDelta) {
      process.stdout.write(item.contentBlockDelta.delta?.text);
    }
  }
} catch (err) {
  console.log(`ERROR: Can't invoke '${modelId}'. Reason: ${err}`);
  process.exit(1);
}
```
+  有关 API 的详细信息，请参阅 *适用于 JavaScript 的 AWS SDK API 参考[ConverseStream](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/ConverseStreamCommand)*中的。

## Meta Llama
<a name="meta_llama"></a>

### Converse
<a name="bedrock-runtime_Converse_MetaLlama_javascript_topic"></a>

以下代码示例演示如何使用 Bedrock 的 Converse API 向 Meta Llama 发送文本消息。

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime#code-examples)中查找完整示例，了解如何进行设置和运行。
使用 Bedrock 的 Converse API 向 Meta Llama 发送文本消息。  

```
// Use the Conversation API to send a text message to Meta Llama.

import {
  BedrockRuntimeClient,
  ConverseCommand,
} from "@aws-sdk/client-bedrock-runtime";

// Create a Bedrock Runtime client in the AWS Region you want to use.
const client = new BedrockRuntimeClient({ region: "us-east-1" });

// Set the model ID, e.g., Llama 3 8b Instruct.
const modelId = "meta.llama3-8b-instruct-v1:0";

// Start a conversation with the user message.
const userMessage =
  "Describe the purpose of a 'hello world' program in one line.";
const conversation = [
  {
    role: "user",
    content: [{ text: userMessage }],
  },
];

// Create a command with the model ID, the message, and a basic configuration.
const command = new ConverseCommand({
  modelId,
  messages: conversation,
  inferenceConfig: { maxTokens: 512, temperature: 0.5, topP: 0.9 },
});

try {
  // Send the command to the model and wait for the response
  const response = await client.send(command);

  // Extract and print the response text.
  const responseText = response.output.message.content[0].text;
  console.log(responseText);
} catch (err) {
  console.log(`ERROR: Can't invoke '${modelId}'. Reason: ${err}`);
  process.exit(1);
}
```
+  有关 API 详细信息，请参阅《适用于 JavaScript 的 AWS SDK API Reference》**中的 [Converse](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/ConverseCommand)。

### ConverseStream
<a name="bedrock-runtime_ConverseStream_MetaLlama_javascript_topic"></a>

以下代码示例演示如何使用 Bedrock 的 Converse API 向 Meta Llama 发送文本消息并实时处理响应流。

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime#code-examples)中查找完整示例，了解如何进行设置和运行。
使用 Bedrock 的 Converse API 向 Meta Llama 发送文本消息并实时处理响应流。  

```
// Use the Conversation API to send a text message to Meta Llama.

import {
  BedrockRuntimeClient,
  ConverseStreamCommand,
} from "@aws-sdk/client-bedrock-runtime";

// Create a Bedrock Runtime client in the AWS Region you want to use.
const client = new BedrockRuntimeClient({ region: "us-east-1" });

// Set the model ID, e.g., Llama 3 8b Instruct.
const modelId = "meta.llama3-8b-instruct-v1:0";

// Start a conversation with the user message.
const userMessage =
  "Describe the purpose of a 'hello world' program in one line.";
const conversation = [
  {
    role: "user",
    content: [{ text: userMessage }],
  },
];

// Create a command with the model ID, the message, and a basic configuration.
const command = new ConverseStreamCommand({
  modelId,
  messages: conversation,
  inferenceConfig: { maxTokens: 512, temperature: 0.5, topP: 0.9 },
});

try {
  // Send the command to the model and wait for the response
  const response = await client.send(command);

  // Extract and print the streamed response text in real-time.
  for await (const item of response.stream) {
    if (item.contentBlockDelta) {
      process.stdout.write(item.contentBlockDelta.delta?.text);
    }
  }
} catch (err) {
  console.log(`ERROR: Can't invoke '${modelId}'. Reason: ${err}`);
  process.exit(1);
}
```
+  有关 API 的详细信息，请参阅 *适用于 JavaScript 的 AWS SDK API 参考[ConverseStream](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/ConverseStreamCommand)*中的。

### InvokeModel
<a name="bedrock-runtime_InvokeModel_MetaLlama3_javascript_topic"></a>

以下代码示例演示如何使用调用模型 API 向 Meta Llama 发送文本消息。

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime#code-examples)中查找完整示例，了解如何进行设置和运行。
使用调用模型 API 发送文本消息。  

```
// Send a prompt to Meta Llama 3 and print the response.

import {
  BedrockRuntimeClient,
  InvokeModelCommand,
} from "@aws-sdk/client-bedrock-runtime";

// Create a Bedrock Runtime client in the AWS Region of your choice.
const client = new BedrockRuntimeClient({ region: "us-west-2" });

// Set the model ID, e.g., Llama 3 70B Instruct.
const modelId = "meta.llama3-70b-instruct-v1:0";

// Define the user message to send.
const userMessage =
  "Describe the purpose of a 'hello world' program in one sentence.";

// Embed the message in Llama 3's prompt format.
const prompt = `
<|begin_of_text|><|start_header_id|>user<|end_header_id|>
${userMessage}
<|eot_id|>
<|start_header_id|>assistant<|end_header_id|>
`;

// Format the request payload using the model's native structure.
const request = {
  prompt,
  // Optional inference parameters:
  max_gen_len: 512,
  temperature: 0.5,
  top_p: 0.9,
};

// Encode and send the request.
const response = await client.send(
  new InvokeModelCommand({
    contentType: "application/json",
    body: JSON.stringify(request),
    modelId,
  }),
);

// Decode the native response body.
/** @type {{ generation: string }} */
const nativeResponse = JSON.parse(new TextDecoder().decode(response.body));

// Extract and print the generated text.
const responseText = nativeResponse.generation;
console.log(responseText);

// Learn more about the Llama 3 prompt format at:
// https://llama.meta.com/docs/model-cards-and-prompt-formats/meta-llama-3/#special-tokens-used-with-meta-llama-3
```
+  有关 API 的详细信息，请参阅 *适用于 JavaScript 的 AWS SDK API 参考[InvokeModel](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/InvokeModelCommand)*中的。

### InvokeModelWithResponseStream
<a name="bedrock-runtime_InvokeModelWithResponseStream_MetaLlama3_javascript_topic"></a>

以下代码示例演示如何使用调用模型 API 向 Meta Llama 发送文本消息并打印响应流。

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime#code-examples)中查找完整示例，了解如何进行设置和运行。
使用调用模型 API 发送文本消息并实时处理响应流。  

```
// Send a prompt to Meta Llama 3 and print the response stream in real-time.

import {
  BedrockRuntimeClient,
  InvokeModelWithResponseStreamCommand,
} from "@aws-sdk/client-bedrock-runtime";

// Create a Bedrock Runtime client in the AWS Region of your choice.
const client = new BedrockRuntimeClient({ region: "us-west-2" });

// Set the model ID, e.g., Llama 3 70B Instruct.
const modelId = "meta.llama3-70b-instruct-v1:0";

// Define the user message to send.
const userMessage =
  "Describe the purpose of a 'hello world' program in one sentence.";

// Embed the message in Llama 3's prompt format.
const prompt = `
<|begin_of_text|><|start_header_id|>user<|end_header_id|>
${userMessage}
<|eot_id|>
<|start_header_id|>assistant<|end_header_id|>
`;

// Format the request payload using the model's native structure.
const request = {
  prompt,
  // Optional inference parameters:
  max_gen_len: 512,
  temperature: 0.5,
  top_p: 0.9,
};

// Encode and send the request.
const responseStream = await client.send(
  new InvokeModelWithResponseStreamCommand({
    contentType: "application/json",
    body: JSON.stringify(request),
    modelId,
  }),
);

// Extract and print the response stream in real-time.
for await (const event of responseStream.body) {
  /** @type {{ generation: string }} */
  const chunk = JSON.parse(new TextDecoder().decode(event.chunk.bytes));
  if (chunk.generation) {
    process.stdout.write(chunk.generation);
  }
}

// Learn more about the Llama 3 prompt format at:
// https://llama.meta.com/docs/model-cards-and-prompt-formats/meta-llama-3/#special-tokens-used-with-meta-llama-3
```
+  有关 API 的详细信息，请参阅 *适用于 JavaScript 的 AWS SDK API 参考[InvokeModelWithResponseStream](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/InvokeModelWithResponseStreamCommand)*中的。

## Mistral AI
<a name="mistral_ai"></a>

### Converse
<a name="bedrock-runtime_Converse_Mistral_javascript_topic"></a>

以下代码示例演示如何使用 Bedrock 的 Converse API 向 Mistral 发送文本消息。

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime#code-examples)中查找完整示例，了解如何进行设置和运行。
使用 Bedrock 的 Converse API 向 Mistral 发送文本消息。  

```
// Use the Conversation API to send a text message to Mistral.

import {
  BedrockRuntimeClient,
  ConverseCommand,
} from "@aws-sdk/client-bedrock-runtime";

// Create a Bedrock Runtime client in the AWS Region you want to use.
const client = new BedrockRuntimeClient({ region: "us-east-1" });

// Set the model ID, e.g., Mistral Large.
const modelId = "mistral.mistral-large-2402-v1:0";

// Start a conversation with the user message.
const userMessage =
  "Describe the purpose of a 'hello world' program in one line.";
const conversation = [
  {
    role: "user",
    content: [{ text: userMessage }],
  },
];

// Create a command with the model ID, the message, and a basic configuration.
const command = new ConverseCommand({
  modelId,
  messages: conversation,
  inferenceConfig: { maxTokens: 512, temperature: 0.5, topP: 0.9 },
});

try {
  // Send the command to the model and wait for the response
  const response = await client.send(command);

  // Extract and print the response text.
  const responseText = response.output.message.content[0].text;
  console.log(responseText);
} catch (err) {
  console.log(`ERROR: Can't invoke '${modelId}'. Reason: ${err}`);
  process.exit(1);
}
```
+  有关 API 详细信息，请参阅《适用于 JavaScript 的 AWS SDK API Reference》**中的 [Converse](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/ConverseCommand)。

### ConverseStream
<a name="bedrock-runtime_ConverseStream_Mistral_javascript_topic"></a>

以下代码示例演示如何使用 Bedrock 的 Converse API 向 Mistral 发送文本消息并实时处理响应流。

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime#code-examples)中查找完整示例，了解如何进行设置和运行。
使用 Bedrock 的 Converse API 向 Mistral 发送文本消息并实时处理响应流。  

```
// Use the Conversation API to send a text message to Mistral.

import {
  BedrockRuntimeClient,
  ConverseStreamCommand,
} from "@aws-sdk/client-bedrock-runtime";

// Create a Bedrock Runtime client in the AWS Region you want to use.
const client = new BedrockRuntimeClient({ region: "us-east-1" });

// Set the model ID, e.g., Mistral Large.
const modelId = "mistral.mistral-large-2402-v1:0";

// Start a conversation with the user message.
const userMessage =
  "Describe the purpose of a 'hello world' program in one line.";
const conversation = [
  {
    role: "user",
    content: [{ text: userMessage }],
  },
];

// Create a command with the model ID, the message, and a basic configuration.
const command = new ConverseStreamCommand({
  modelId,
  messages: conversation,
  inferenceConfig: { maxTokens: 512, temperature: 0.5, topP: 0.9 },
});

try {
  // Send the command to the model and wait for the response
  const response = await client.send(command);

  // Extract and print the streamed response text in real-time.
  for await (const item of response.stream) {
    if (item.contentBlockDelta) {
      process.stdout.write(item.contentBlockDelta.delta?.text);
    }
  }
} catch (err) {
  console.log(`ERROR: Can't invoke '${modelId}'. Reason: ${err}`);
  process.exit(1);
}
```
+  有关 API 的详细信息，请参阅 *适用于 JavaScript 的 AWS SDK API 参考[ConverseStream](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/ConverseStreamCommand)*中的。

### InvokeModel
<a name="bedrock-runtime_InvokeModel_MistralAi_javascript_topic"></a>

以下代码示例演示如何使用调用模型 API 向 Mistral 模型发送文本消息。

**适用于 JavaScript (v3) 的软件开发工具包**  
 还有更多相关信息 GitHub。在 [AWS 代码示例存储库](https://github.com/awsdocs/aws-doc-sdk-examples/tree/main/javascriptv3/example_code/bedrock-runtime#code-examples)中查找完整示例，了解如何进行设置和运行。
使用调用模型 API 发送文本消息。  

```
import { fileURLToPath } from "node:url";

import { FoundationModels } from "../../config/foundation_models.js";
import {
  BedrockRuntimeClient,
  InvokeModelCommand,
} from "@aws-sdk/client-bedrock-runtime";

/**
 * @typedef {Object} Output
 * @property {string} text
 *
 * @typedef {Object} ResponseBody
 * @property {Output[]} outputs
 */

/**
 * Invokes a Mistral 7B Instruct model.
 *
 * @param {string} prompt - The input text prompt for the model to complete.
 * @param {string} [modelId] - The ID of the model to use. Defaults to "mistral.mistral-7b-instruct-v0:2".
 */
export const invokeModel = async (
  prompt,
  modelId = "mistral.mistral-7b-instruct-v0:2",
) => {
  // Create a new Bedrock Runtime client instance.
  const client = new BedrockRuntimeClient({ region: "us-east-1" });

  // Mistral instruct models provide optimal results when embedding
  // the prompt into the following template:
  const instruction = `<s>[INST] ${prompt} [/INST]`;

  // Prepare the payload.
  const payload = {
    prompt: instruction,
    max_tokens: 500,
    temperature: 0.5,
  };

  // Invoke the model with the payload and wait for the response.
  const command = new InvokeModelCommand({
    contentType: "application/json",
    body: JSON.stringify(payload),
    modelId,
  });
  const apiResponse = await client.send(command);

  // Decode and return the response.
  const decodedResponseBody = new TextDecoder().decode(apiResponse.body);
  /** @type {ResponseBody} */
  const responseBody = JSON.parse(decodedResponseBody);
  return responseBody.outputs[0].text;
};

// Invoke the function if this file was run directly.
if (process.argv[1] === fileURLToPath(import.meta.url)) {
  const prompt =
    'Complete the following in one sentence: "Once upon a time..."';
  const modelId = FoundationModels.MISTRAL_7B.modelId;
  console.log(`Prompt: ${prompt}`);
  console.log(`Model ID: ${modelId}`);

  try {
    console.log("-".repeat(53));
    const response = await invokeModel(prompt, modelId);
    console.log(response);
  } catch (err) {
    console.log(err);
  }
}
```
+  有关 API 的详细信息，请参阅 *适用于 JavaScript 的 AWS SDK API 参考[InvokeModel](https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/client/bedrock-runtime/command/InvokeModelCommand)*中的。